Properties of the Number -28730

Twenty-Eight Thousand Seven Hundred Thirty

Basics

Value: -28731 → -28730 → -28729

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 5 × 13 ² × 17

Divisors: 1, 2, 5, 10, 13, 17, 26, 34, 65, 85

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -111000000111010

Octal: -70072

Duodecimal: -14762

Hexadecimal: -703a

Square: 825412900

Square Root: 169.49926253526885

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

G.f.: A(x,y) = ∑_n=-oo..+oo (x·y)^n*(n+1/2) * C(x)^2·n-1, where C(x) = 1 + x·C(x)² is the g.f. of the Catalan numbers (A000108). A355346

a(n) = n²*(n²+1). A71253

Numbers m that are the hypotenuse of exactly 22 distinct integer-sided right triangles, i.e., m² can be written as a sum of two squares in 22 ways. A97103

a(n) = 2·Catalan(n) - Catalan(n-1). A782

a(n) = floor( (4/3)*π*n³ ). A66645

Numbers that are the sum of 2 nonzero squares in 5 or more ways. A25296

Sum of two powers of 13. A72390

a(n) is the number of large or small squares that are used to tile primitive squares of type 1 whose length of side is A344333(n). A344334

Numbers that are the sum of 2 nonzero squares in 6 or more ways. A25297

Numbers that are the sum of 2 distinct nonzero squares in 5 or more ways. A25315